A 34 year old athlete is participating in a marathon race .Following mechanism will account for transport of glucose into his muscle during running:Select one:a. Facilitated diffusionb. Simple Diffusionc. Primary active transportd. Counter-transportClear my choice
Question
A 34 year old athlete is participating in a marathon race .Following mechanism will account for transport of glucose into his muscle during running:Select one:a. Facilitated diffusionb. Simple Diffusionc. Primary active transportd. Counter-transportClear my choice
Solution
The correct answer is a. Facilitated diffusion.
Here's why:
During exercise, like running a marathon, the body needs a quick and efficient way to get glucose (the body's main source of energy) into the muscle cells. This is done through a process called facilitated diffusion.
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Glucose molecules are too large and polar to simply diffuse across a lipid membrane, so they need the help of transport proteins.
These proteins, called glucose transporters, are embedded in the cell membrane and have a specific shape that allows them to bind to glucose molecules. When a glucose molecule binds to the transporter, it changes shape and carries the glucose across the membrane and into the cell.
This process does not require energy (ATP), which is why it's considered a type of passive transport. This is ideal during exercise, when the body needs to conserve as much energy as possible for the muscles.
So, while simple diffusion (b) and active transport (c and d) are also methods of moving substances across membranes, they are not the primary methods used for glucose transport during exercise.
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